What occurred while the lunar surface was melted by radioactive heat?

A) lava flows formed maria.

B) earth and a planetesimal collided.

C) the moon became geologically inactive.

D) bombardment by meteoroids formed the highlands.

How long does a bird live

A 6-year-old child has been wetting the bed at night since the birth of a baby brother. what defense mechanism is the child using to cope with the stress of accepting a new family member

Which organ supplies a human's bloodstream with oxygen from the air, which can then be taken through the blood to the muscle cells of the arm?

Why are there seasons? A.) Earth revolves around of the sun. B.) Earth rotates on its axis. C.) Earth's axis is titled. D.) The moon revolves around Earth.

In the term trace element, the adjective trace means that a. the elemental is required in very small amount. b. the element can be used as a label to trace atoms through an organism's metabolism. c. the elemnt is very rare oon Earth. d.

Which blood vessel directly carries blood into the capillaries?

What are the three common patterns of population dispersion? What might cause a population to disperse in an evenly spaced pattern? (Site 1)

The Body cannot store

What is a sexual reproduction and a asexual

Why is continental crust usually older than oceanic crust?